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It's a famous story that has been told several times before - first in 1937 as a drama with Janet Gaynor and Fredric March, then as a musical in 1954 with Judy Garland and James Mason and then again in 1976 starring Barbra Streisand and Kris Kristofferson, but it felt so personal to Cooper he didn't see it as remake.

"I always wanted to make a movie. I love cinema so much, and I've been around it for almost 20 years as an actor and a producer, so I always knew at some point I would have to do it," he says.

"And I really wanted to tell a love story about two people who actually are madly in love with each other and how hard that is still to endure.

"I also wanted to talk about family and childhood and trauma and finding your voice and all the themes the movie deals with, so it was very exciting to explore all of those things cinematically.

"Because it was coming from a personal place, I still don't see it as a retelling - it's a movie that is within the framework of this property."

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The film also looks at the endless tussle between artistic integrity and commercial success and if the two things can ever go hand in hand.

Cooper, 43, is thoughtful about that balance. "It depends on how you define success," he says. "I think, like the movie, the key is to figure out what you want to say and how to say it and that is all you have to worry about.

"You have to really be open and honest with yourself and about what you want to talk about and I think it takes time and living life.

"Some people figure that out at eight. I think I was 39 when I figured it out."

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While he has worked with a string of accomplished filmmakers along the way, such as Clint Eastwood, Derek Cianfrance and Cameron Crowe, it was David O Russell (who'd shepherded him to two of his Oscar nominations for Silver Linings Playbook and American Hustle) who helped Cooper realise his own potential as director.

"David O Russell is the one. I would never have been able to make this movie if I hadn't worked with David O Russell and if he hadn't have been so generous in allowing me to be a part of his process. We always talked through a lot."

Bringing in a star as talented as Lady Gaga - who makes her feature film debut in a leading role - was instrumental to making the film a success but for Cooper it was a big responsibility.

"When people entrust themselves to you as a filmmaker and a storyteller, when they are going to give all of themselves and they know what is demanded of them, there is a trust that has to be there.

"If it's not there, I don't know how you can ever do it in a real way so you have to come from an honest place and I have to do the work myself.

"The biggest way you can get someone to do what you want is to do it yourself.

"She'd done incredible work as an actress, but to make this huge transition... it felt like we were at the same point individually in our work, and we both needed the same thing from each other, essentially, in order to jump the tracks to this other place."

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Movies and Glastonbury Festival

And once he got to the other side, he was not interested in making things easy for himself, singing live alongside Lady Gaga for the musical numbers, and even filming on stage at Glastonbury and Coachella.

"At Glastonbury, it was just four of us," he recalls. "My buddy operated the second camera and we had four minutes to do it."

Those four minutes of stage time were donated by none other than Kristofferson, who happened to be performing at the festival last summer, and who let Cooper come out on stage to get his shot at the beginning of his set.

"I remember everything about it. I got to perform on the stage where I'd seen Robert Plant, Jack White, Thom Yorke - and the best part about it was, after it was over, I got to say, 'Ladies and gentlemen, Mr Kris Kristofferson'. Then he walked out. I'll never forget that."

Bradley Cooper on the Pyramid Stage ahead of Kris Kristofferson

A Star Is Born is released in UK cinemas on October 3.

It is the directorial debut for Cooper, who also stars in the film alongside Lady Gaga, who plays the aspiring singer.

Country music legend Kris Kristofferson was introduced on the Pyramid Stage at Glastonbury Festival 2017 by film star Bradley Cooper, who played guitar for a few minutes in what appeared at first to be a sound check.

He told the audience crews were setting up for filming and several cameras followed him around the stage.

Somerset Live digital editor Thomas Cock reviewed the set that followed and saw the filming. He said: "I had no idea what was going on at first.

"This chap with long hair and a beard was playing guitar while we were waiting for Kris Kristofferson to come on.

"He was throwing his head around and showboating with a green Gibson guitar. At first I thought he was a roadie doing a sound check. Then the penny dropped. He had a pretty warm reaction."

Then he said: “You guys were awesome, that was great. It’s my sheer pleasure to introduce Kris Kristofferson.”